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The thirty world's busiest airports by passenger traffic are measured by number of total passengers (data provided by Airports Council International and BAA). One passenger is described as someone who arrives in, departs from, or transfers through the airport on a given day. Hartsfield-Jackson International Airport in Atlanta has been the world's busiest airport every year since 2000 whereas London has the world's busiest city airspace with 2 of its airports regularly found in the top thirty.

For consistency, the ACI's annual figures are always used in the final presentation and ranking, even where official figures released by airport operators or authorities may fail to tally.